package top.asteam.springcloud.lb.impl;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;
import top.asteam.springcloud.lb.LoadBalancer;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @Author Rock Wang
 * @Time 2021/4/18
 */
@Component
public class WxwRule implements LoadBalancer {

    private AtomicInteger atomicInteger = new AtomicInteger(0);

    public final int getAndIncrement() {
        int current;
        int next;

        do {
            current = this.atomicInteger.get();
            next = current >= 2147483647 ? 0 : current + 1;
            System.out.println("第" + next + "次访问next");
        } while (!this.atomicInteger.compareAndSet(current, next));
        return next;
    }

    @Override
    public ServiceInstance instance(List<ServiceInstance> serviceInstances) {

        int index = getAndIncrement() % serviceInstances.size();

        return serviceInstances.get(index);
    }
}
